How useful is Linux scripting?

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http://unix.stackexchange.com – I am a beginner user of Linux and have worked primarily with GUI. I am trying to move to intermediate level by learning the shell commands. In online Linux forums it's often the consensus that to be an advanced Linux user one should know scripting. I myself have no experience with scripting the OS and don't know what the hype is about. My understanding is that its just a convenient way for system admins to take backups by issuing a set of copy commands. Is this understanding correct? What type of advanced tasks are commonly performed using scripting? On the scale of 1 to 10, 1 being overr (HowTos)